This is definitely getting there, the narrative is much better than when I first read this. However, it still reads a little bland. There's nothing here that makes me care specifically about this SCP, it might as well be an anomalous item. I think the characters behind this need more motivation and development. Why did they want to make this so badly? Who was this mysterious project head who survived and got away? Did they do this intentionally?

NOTE: I'm skimming through this as I think the concept is the big problem here. I won't catch everything, just stuff that jumps out

under no circumstances be tipped

This goes without saying. Everything in the containment procedures is an instruction, "Under no circumstances" is a pointless phrase.

to avoid the risk of

Don't explain yourself in the containment procedures. Just say what to do with the SCP, explanations go in the description.

It is mandatory that said tests be done in a closed room at least 200 metres away from the facility

I think it would be better to have a specialised area for something like this, or just not test it at all.
200m from the facility is quite vague, maybe specify "from the nearest inhabited area" or something like that

and an experiment proposed by Dr. █████ involving displacing the pendulum upon the salt flat located in ████, USA has been denied due to the possible dangerous nature of the experiment.

I don't think this should be here. Either put it in an addendum and develop it a bit more or cut it out completely, right now it looks out of place.

Are the "corpse identified to be Dr. ████████" and "Dr. ████████'s corpse" different corpses? When you censor names like this it makes it kind of confusing.

leading to the death of the entire team aside from the project head and the cancellation of the project, after the disappearance of the project head.

This makes it sound like they didn't cancel until after PH went missing. I think if almost the entire research team died they would cancel it straight away. Maybe " leading to the death of the entire team aside from the project head (PoI-3342-1). Following this the project was cancelled and PoI-3342-1 disappeared." or something similar.

on Dr. ████████'s corpse

Needs a full stop
Also, how was it "on" their corpse? Like literally on, or near? Was it placed on the body, did it fall on it?